高一化学简单题，悬赏20分！画圈的题详解！第五题第三问为什么要先加热v2o5再滴入硫酸？求详解，悬

Purpose:
See mold (mold) the circumstances under which grow the fastest
Experimental materials: two slices of bread, water, a paper bag
Experimental methods: (1) Take 1 slice of bread, tear (slice) in two, one on the dry environment, a sprinkle of water on top
(2) and then take a piece of bread, torn in half, one in a dark environment (in a paper bag) and one on the glare
Results: top watering bread mold grow faster on
On the paper bag of bread mold grow faster on
Experimental results: mold in damp dark environment grow faster

个